Lighting requires extreme values (Blender 2.8)
There is nothing extreme about the values. You should not worry about them. Those are only numbers. It doesn't matter if it's 1 or 1000000. The proportions matter more - if you have sunlight in the scene it should not be dimmer than light from a light bulb and so on. 

If it is more convenient for you to work with some specific units you can adjust the exposure to match them in the Color Management settings:



or under Film settings: